<template>
  <div id="app">
    <div class="box">
      <div class="left"></div>
      <div class="mid"></div>
      <div class="right"></div>
    </div>
  </div>
</template>

<script>
export default {
  name: "App",
  components: {},
};
</script>

<style lang="less" scoped>
.box {
  display: flex;
  width: 100%;
  height: 100vh;
  flex: 1;
  background-color: aqua;
}
.left {
  flex: 1;
  background-color: aqua;
}
.mid {
  flex: 1;
  background-color: pink;
}
.right {
  flex: 1;
}
</style>
